Bathtub



FIG. 1 is a perspective view taken from the front and top of a bathtub showing my new design;

FIG. 2 is a top plan view thereof; and

FIG. 3 is a side elevational view thereof.

The bathtub skirt has been omitted from FIG. 3 for convenience of illustration. 

The ornamental design for a bathtub, as shown and described. 